"How can we store energy to do work for us later?"
“How does the force it takes to stretch a rubber band depend on the
AMOUNT by which you stretch it?”
Purpose: The purpose of this lab was to find the relationship between distance and force by stretching a rubber band. We also learned about spring(elastic) and potential energy, represented as Us.
Lab: In the first round of this lab we only looped the rubber band around once and measured the amount of force exerted for every centimeter we pulled the band. Then in round two we double looped the rubber band and recorded our findings in a table and chart. In each round we pulled the band from 1 cm all the way to 5 cm. We found that the relationship between force and distance in this lab is directly proportional.
K Value/ Spring Constant: For this lab the slope of x(stretch distance) vs Fs( force in spring) is the spring force. Next we tried to figure out the potential energy of our rubber band. Our graph was in the shape of a triangle so the formula for the area of a triangle to convert it into Us= (1/2)kv.
Real life Connection:
A sling shot. The farther you pull back a sling shot the farther the object will go. If you don't pull hard enough, the sling shot won't produce enough energy and the object won't go far. Here is a link on the science behind slingshots-http://www.sciencebuddies.org/blog/2011/08/slingshot-science-the-physics-in-angry-birds.php
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